Refrigerating apparatus



MN'Ch 17, 1931*. w. Hf F. SCHMIEDING ETAL 1,796,627

REFRIGERATING APPARATUS Fil'ed March 31, 192e MDTOR VEHICLE V gwwmtou.

Patented Mar. 417, 1931 UNITED STATES PATENT oFFlcE 'WARREN F. SCMIEDINGANI) THEODORE L. CHISHOLM, OF DAYTON, OHIO, .AS-

SIGNORS TO FRIGIDAIRE CORPORATION, OF DAYTON, OHIO, A CORPORATION OFDELAWARE REFRIGERATING APPARATUS Application led March 31, 1928. SerialNo. 266,399,

This invention relates to refrigerating apparatus and particularly torefrigerating apparatus operated by motor vehicles.

One of the objects vof the invention is to 5 provide a refrigeratedmotor vehicle with'. convenient and economical means for supply- Anotherobject of the 'invention is to pro-y vide a refrigerating; system on. amotor 'vehicle with means for insuring operation of the vehicle motorwhenever there is refrigerating demand.

Further objects and advantages 0I the pres ent invention will beapparent from the following description, reference being had to theaccompanying drawing, wherein a preferred form of the present inventionVis clearly shown.

1 The single 'fr' re of the drawing indicates diagrammatica lya'refrigerating system in` connection with' a motor vehicle constructedin accordance with our invention.

'Referring to the drawing 10` designates any suitable motor vehicleoperated'by a motor 11 which includes the usual fan l12, radiator 13 andaccessory shaft'l'4, and is pro.-

vided with Athe usual starting motor,- ll The starting motoris providedwith. the usual manually operated switch 16which closes the .circuit 17from thebatter 18 through the' starting motor to ground. he motor isalso provided with the usual ignition circuit diaresponse to thetemperature existing withgramr'naticallyrepresented as including a cir"-cuitbreaker 20,-.low tension coil 21, and igni'- tion switch 22,'allconnected vin series between.

the battery main 18': and ground, together with ahigh tension coil 23,distributor 24and spark plugs 25.

COIN

cooled thellatter, 'and an evaporator 32 disposed within an insulatedcompartment on the vehicle and diagrammatically represented by 34. Theparticular construction of the apparatus so far described is immaterialto the present invention and may be of any de sired form.

The compressor isv mounted so that its driving shaft 36 is in alignmentwith the accessory shaft 14 and may be coupled to the latter by means ofa clutch37 herein represented as of the magnetictype. The

compressor crankcase may contaln any desired gearing (not shown) foreii'ectingthe desired speed ratiobetween the vehicle motor andcompressor. Preferably any suitable orm of overrunning or slippingclutch is provided for insuring a substantially constant compressorspeed in spite of variation in the speed of the vehicle motor. As isknown such .clutches permit slipping or disconnection between thedriving and driven members wheneverthe speed of the driven member isabove a. predetermined value. Consequently at any speed of the vehiclemotor above a predetermined low speed the compressor will be driven at aVconstant speed. The particular form of such clutch is immaterial to theinvention lbut an example of one suitable formof construction is shownin the patent tovApple No. 698,888, April 29,

1902. Athermostat is provided for actuating the compressor in responsetothe (lc-- mand of the evaporator and includes a bulb 39 disposed at.any suitable point within thel refrigerated' compartment 34, chargedwith a volatile liquid and connected by means. of

conduit 39a 'to a metal bellows 40. The metal bellows thus contracts andexpands in in the/compartment 34 'and actuates a snap switch 42 bymeansof the lever 43. The switch is providedV with an insulatin rod 45carrying three contact blades, 46, 4 and 48, all of which are elevatedtothe position shown in the drawings when the bellows collapses inresponse to low temperature within the compartment 34V and which arelowered to close their respective circuits whenever the bellows expandsin response to a high temperature. The contact' blade 46,

when closed, completes the ignition circuit 4from the low tension coil21 to ground in parallel withthe ignition switch-'2 2. The contact blade47, when closed, connects the battery main18 tothe wire 50 which isconnected to the governor switch 51, to be described below, and whichmay connect the wire 50 tothe wire 52 thus completing the circuittoet-he cranking motor 15. The con tact blade 48, when closed connectsthe batter'y main 18 to the wire 53 which also leads .to the governorswitch 51, and which may be connected by the governor switch through thewire 54 to the magnetic clutch 37, the other terminal of which isgrounded. The accessory shaft 14 is provided with any suitable governor55 which operates the switch 51 which completes the connection between'the wires 50 and 52 when the motor is idle,

ment 34 rises to the 'point where refrigeration is required, the switch42 is closed, and whenever the temperature is lowered to the point whererefrigeration is not required this switch is opened. lAssuming that thevehicle motor is not operating when the switch 42 is closed, thegovernor vswitch is in the position indicated in full lines,'completingcontact between the wires 50 and 52. The contact 46 completes theignition circuit. The contact 47 completes thefcircuit to the crankingmotor which thereupon'eranks the vehicle motor until the latterbecomesself-operative. When this occurs the'governorswitch moves fromthe full line to the dotted line position, breaking contact betweenwiresl 50 and 52, and thus i interrupting the cranking'motor circuit andestablishing contact between wires 5 3 and 54, thus completing thecircuit to the magnetic clutch 37 sincethe contact 48 has in the mean'-time been closed. The compressor is now operated from the vehicle motoruntil the refrigeration demand hasbeen satisfied, at which time theswitch 42 will be opened, breaking the ignition circuit and stopping thevehicle motor, unless in the meantime the switch 22 has been closedby'hand to prevent stopping of *the motor when refrigeration demand Ifthe'Jvehicle motor shouldbe running when theautomatic switch 42 closesthe governor switch 51 will be in the dptted line position as abovedescribed, and the contact 48 will thereupon immediately energize themag;

netic clutch' to operate the compressor. The

cranking motor 1.5 cannot be actuated because 'forms might be adopted,all coming within the'scope of the claims which follow.

What is claimed is as follows: Y 1. Refrigerating apparatus comprisingin combination, a motor vehicle, a motor for drivingthe vehicle, arefrigerating system including a compressor, and means for mechan icallyconnecting the compressor to the vehicle motor in response torefrigerating demand.

2. Refrigerating apparatus comprising in combination, a motor vehicle, amotor for driving the vehicle, a refrigerating system including acompressor adapted to be operated by the vehicle motor, and means forautomatically starting the vehicle motor in response to refrigeratingdemand.

3. Refrigerating apparatus comprising in combination, a motor vehicle, arefrigerating system including a compressor adapted to be operated bythe vehicle motor, manually operated means for starting the vehiclemotor,

means for automatically starting the vehicle motor in response torefrigeration demand, and means responsive to running of thevehiclemotor for preventing operation `of th automatic starting means. v

4. Refrigerating apparatus comprising in combination, a motor vehicle, amotor for driving the vehicle, a refrigerating system including acompressor adapted to be operated by the vehicle motor, means forstarting the vehicle motor in response to refrigeration demand, andmeans for stopping the vehicle motor in response to cessation of demand.

5. Refrigerating apparatus comprising in combination, a motor vehicle, arefrigerating system including a compressor adapted to be operated 'bythe vehicle motor, means for starting the `vehicle motor in response torefrigeration demand, and means operating automatically in response tocessation of refrigerating demand and tending to stop the vehicle motor,and manually operated means for preventing the motor from stopping inresponse .to cessation of refrigeratmg demand.

6. Refrigerating apparatus comprising in combination, a motor vehicle, amotor for driving the vehicle, a refrigerating system carried .by thevehicle, a control circuit for the vehicle motor, manually operatedmeans for completing the circuit, and means oper- `tion of therefrigerating ated by the refrigeratin system in response torefrigerating deman for completingl the circuit. v

7. Refrigerating apparatus including 'a motor vehicle having an ignitioncircuit, a refrigerating system carried by the vehicle, manuallyoperated means for completing or interrupting the ignition circuit, andmeans operated automatically by the refrigerating Vsystem in parallelwith the manual means for completing or interrupting the'ignitioncircuit.

8. Refrigerating apparatus including a motor vehicle, a cranking motorfor the vehicle motor, a refrigerating system carried by the vehicle, acircuit for the cranking motor, manually operated means for completingor interrupting the circuit, and means operated automatically by therefrigerating system in parallel with the said manual means for com-`interrupting the last mentioned circuit in response to running of thevehicle motor.

10. Refri erating `apparatus comprising in combination a motor vehicle,a refrigerating system including a compressor, means for connecting thecompressor to the vehicle motor in response to refrigerating demand andmeans for-preventing theo eration of the connection means when the vecle motor is not operating.

11. Refrigerating apparatus comprising in'conibination al motor vehicle,a motor for driving the vehicle, a refrigerating system including acompressor, means for connecting the com ressor to the vehicle motor, acontrol circuit for said connecting means and means responsive tooperation of the motor for closing'or interrupting said circuit.

12. Refrigerating apparatus comprising in combination a motor vehicle, amotor for driving the vehicle, av refrigerating system includingl acompressor, means for startin the vehic e motor in response to thecondisystem and means Lresponsive to running the motor for conn'ectinthe compressor to the vehicle motor. '13. frigerating apparatuscomprising in combination va motor vehicle, a motor forl driving the.vehicle, a rerigerating system in combination a motor vehicle, a motorforl driving the vehicle, a refrigerating system including a compressor,manually operated means for starting and stoppin the motor, meansresponsive to refrigerating demand for connecting the compressor to themotor and for preventing the manually operated means from stopping themotor'.

15. Refrigerating apparatus comprising in combination a motor vehicle,amotor for drivin the vehicle, a refrigerating systemL including acompressor, a clutch for connecting'the compressor to the vehicle motor,and means actuating the clutch in response to refrigerating demand. "I

16. Refiigerating apparatus comprising in combination a motor vehicle, avariable speed motor for driving the vehicle, a refrigerating systemincludin a com ressor, and means for mechanically riving t e compressorfrom the vehicle motor including means for driving the compressor at aconstant speed whenever the vehicle motor is running above apredetermined low speed.

^ 17. Refrigerating apparatus .comprisin in combination a motor vehicle,a variable speed motor for driving the. vehicle, arefrierating systemincludin a com ressor, an means for mechanically. riv i pressor from thevehiclemotor inc u geo At e com?` over-running clutch for driving thecoinpressor at a constant speed during variations in motor speed above aredetermined value.

In testimony Whereo we hereto aiiixtour signatures. f WARREN H. F.SCHMIEDING.. THEODORE L. CHISHOLM.

including a compressor, means for connectl ing the comtplil'essor to themotor in response to rcfrigera g demand, and meansfor stoplping themotor and disconnecting the compressor in responsc'to cessation ofdemand.

14. Refrigerating apparatus comprising lmo

